\documentclass[a4paper,12pt]{article} 
\usepackage{tikz}
\usepackage{xeCJK}
\usepackage{smartdiagram}

\begin{document}
\thispagestyle{empty}
\begin{center}
\smartdiagram[circular diagram]{circular, 存储管理子系统, {Rexit, aaa}}
\smartdiagram[flow diagram]{flow, {b, c}, d}
\smartdiagram[descriptive diagram]{descriptive,{b,c},d}
\smartdiagram[priority descriptive diagram]{priority descriptive,{b,c},d}
\smartdiagram[bubble diagram]{bubble diagram,{b,c},d,e,f}
\smartdiagram[constellation diagram]{constellation diagram,{b,c},d,e,f}
\smartdiagram[connected constellation diagram]{connected constellation, {b, c},d,e,f}
\smartdiagram[sequence diagram]{sequence, {b, c},d,e,f}

\end{center}
%% \newpage
%% \begin{center}
%% \smartdiagramset{
%% uniform color list=gray!60!black for 3 items,
%% back arrow disabled=true,
%% additions={
%% additional item offset=0.85cm,
%% additional item border color=red,
%% additional connections disabled=false,
%% additional arrow color=red,
%% additional arrow tip=stealth,
%% additional arrow line width=1pt,
%% additional arrow style=latex’,
%% }
%% }

  
%% \smartdiagramadd[flow diagram:horizontal]{%
%% PGF,Ti\textit{k}Z,Smartdiagram%
%% }{%
%% below of module1/Low Level, below of module3/High level%
%% }

%% \end{center}

\end{document}

